Finding the Fourth Proportional to 1,776.42, 2,451.39 and 990.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,776.42 : 2,451.39 = 990.45 : x
2. Step 2: Convert to fraction form
   1,776.42/2,451.39 = 990.45/x
3. Step 3: Cross multiply
   1,776.42x = 2,451.39 × 990.45
4. Step 4: Simplify right side
   1,776.42x = 2,427,979.23
5. Step 5: Solve for x
   x = 2,427,979.23/1,776.42
6. Step 6: Final answer
   x = 1,366.78